The adsorption of poly(ethylene oxide) on mica is promoted by cationic end groups. These cation-terminated polymers adsorb on mica surfaces via ion exchange, resulting in a film of polymer attached to the layered silicate. The experimental ion exchange isotherms resemble those for small cations, but with a much reduced surface-exchange capacity for the polymeric cations. The number of adsorbed chains decreases with increasing chain length while the mass adsorbed increases.